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Restricted Stock, Stock Options and Other Stock Plans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Feb. 12, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average remaining contractual term of unexercised stock options   4 years 6 months 7 years 8 months 12 days    
Class A [Member] | November 2014 New Share Repurchase Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Remaining common stock available for repurchase under share repurchase program   404,000 404,000    
Class A [Member] | Maximum [Member] | November 2014 New Share Repurchase Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
New share repurchase program, shares authorized to repurchase         429,000
2019 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to nonvested stock issuances   $ 625 $ 321    
2019 Plan [Member] | Class A [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized 2,500,000        
Description of additional shares authorized for issuance under omnibus incentive plan   The 2019 Plan authorized 2.5 million shares of our Class A Common Stock subject to adjustment for forfeitures and tax withholdings.      
Shares available for issuance under omnibus incentive plan   2,100,000 60,000    
2019 Plan [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 4 years        
Omnibus incentive plan stock option expiration period 10 years        
Weighted-average remaining contractual term of unexercised stock options   7 years 2 months 26 days      
2004 Long-Term Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to nonvested stock issuances   $ 625 $ 321    
2004 Long-Term Compensation Plan [Member] | Class A [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for issuance under omnibus incentive plan   2,100,000 60,000    
2004 Long-Term Compensation Plan [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average remaining contractual term of unexercised stock options     7 years 8 months 1 day 8 years 6 months